Firmware update will not be required for those serial numbers.
Please check the serial numbers from the link here.

■The improvements expected as a result

1. You will now be able to use TAP-in Console (optional and sold separately) with the lens products above. (for Nikon and Canon)
2. Whereas the issue of the exposure becoming unstable under certain particular conditions when using these lenses with either the Canon EOS-1D X Mark II or EOS 80D camera has been reported in some cases, the lens firmware updating will improve for this issue. (for Canon)